Gas-producer.



C. B. LUCKE.

GAS PRODUCER.

APPLICATION FILED 00T. 30, 1907. vy914,663, Patnted Mar. 9, 1909.

2 SHEETS-SHEET 1.

C. E. LUCKE. GAS PRODUCER; APPLICATION FILED 001230, 1907,

914,663; Patented Mar.9,19o9.

2 SHEETS-SHEET 2.

lig-g. 2

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UNIT-ED 'sTATEsHtaTENT orriioi. CHARLES E. LUCKE, 0F NEW YORK, N. Y.

GAS-PRODUCER.

No. 914,663. Specification of `Letters Patent. Patented March 9, 1909. Application illed Gctober 30, 1907. Serial No. 399,801.

To all 'wlwm 'it mtl/y. encountered in gasifying caking bituminous Be it known that l, CHARLES E. LUCKE, a coal. The first is the fact that the coal cakes citizen of the United States, residing in the iu the produccicliamber aud interferes with borough of Manhattan, city of New York, the gasifying operation by preventing air in the county of New York and State of frcin passing through the fuel bed. The 60 New York, have invented a certain new and other dilliculty lies in the fact that the gas useful Im rovement in Coal-Gas Producers, produced contains a considerablequantity of which t e following is a specification, refof tar. The presence of tar is especially oberence being had therein to the aceompanyjectionable in gas for use in gas engines be- CIT 1o ing drawings, forming part thereof. cause it interferesA with the proper opera- 65 My invention relates particularly to the tion of the engine. .Another commoudiilimanufacture 0f gases suitable for use in gas Culty 1S that continuity 0f Operation iS Ulterengines, and my invention has for its obferial with by ash and Clicker removal, reject the economical production of a gas havfruiting in irregularity in quality of das pro- .'5 ing a high efliciencyas a gas engine fuel and duced, due to varying proportions of? hydro- 7o free from substances detrimental to the opgen and volatile gases,

eration of the engine, and having a compo- The only remedy practiced for cakinghas sition particularly suited to gasenglne rebeen the employment 'of down draft proquirements. ducers and the breaking up of the caked 2o A more particular object of'my invention fuel from the top by means of bars. At- 'is is'to produce fromaking bituminous coal a teinpts have been iliade to remove the tar gas which is rich in carbon monoxid comfrom the gas by mechanical means, for exparatively poor in hydro en, free from ample, by "purifying" and Washing; tarry vapors and other hydrocarbons, and also attempts` have been made to split the of great constancy of composition. tar into fixed gases by passing it through a4 so M y invention includes means for passing hlgh temperature zone 1u the fuel bed; but air through and crei-.an i ited fuel bed in in either of these practices the result is allimited and regulated or a justed quantities, Ways imperfect and some tarlike material to distil andcompletely oxidize the volatile remains in the gas. i no fuel constituents, and means for passing the lu carrying out my present invention the so gaseous products of complete combustion coal is fired on a grate located at the top through a second and incandescent fuel bed of a producer chamber, and the burning which is formed from the artlyconsumed coal is fed across the grate 'and allowed to fuel taken from the first fuell bed, the second drop into the lower part of the chamber..

s bedibeing distinct from the first bed and where it forms a second bed 4of incandesso entirely separated therefrom and the two cent coke. The grate at the top of the proheds being so related that unconsnmed gases ducer chamber may be substantially the from the first fucl bed, or gases which are same, pcf se, as ordinarily used under not completely oxidized, will be completely steam boilers .and may be a mechanical 4o oxidized heforel reaching the second fuel stoken. as is shown in the accompanying 95 bed, whereby the exothermic andthe endodrawings. Air is supplied to the grate re tliermic reactions are entirely separated and both' at the top and .bottom in adjusted the gaseous products ot' complete combusproportions and in limited quantities just tion and the incandescent unconsumed fuel sullicient todistil and entirely burn or com is unite to form fixed combustible gases adaptpletely oxidize the volatile gases and the, loo

ed to the desired purposes. tar. The process proceeds by its own heat My invention also includes means for conof combustion, the coal at this stage being tinuously agitatiug the first or high temreduced to gaseous products of complete pcrature fuel bed. to prevent raking of the combustion and coke. If desired enough ad no fuel and to permit the free passage of air ditional air may be admitted to burn some 105A through the fuel. of the coke at this stage or to partly burn My invention Aalso includes several details all of the colte. Green or fresh coal is cor of construction and advantageous features tinuously fed to one side or part of the grato as hereinafter described. while incandescent colic or coke and cinders 55 lu practice two principal difficulties are are discharged from the other side on part No of the grate and fall to the second bed at (hc bottom of the producer chamber. All ot' the unconsunlcd or unoxidized solid p0rtions oi' the fuel are thus transferred or re moved to the second fuel bed. At the same time, as the result of the combustion of the volatile parts ol the coal and possibly of,`

some of the coke. a` steady stream of gaseous produc-ts ot complete Combustion will flow from the surface ot' the grate fire. These gaseous products are completely oxidized, containing no unburned material, and con- .sst chiefly ol carbon dioxid, steam, nitrogru and possibly. a small quantity of free oxygen. These completely oxidized gaseous products ol the grato tire are passed downward through the incandescent coke bed which is built up at the bottom of the producer chamber by the dischar re from the grate above. The top of this co te bed must be farenough below the upper fuel bed to prerent unconsumed gases or the iame of gaseous fuel between the two beds from reaching or extending to the coke bed, thereby securing complete combustion or complete oxidation of the ases distilled from the lirst or upper fueled before the second bed or lower bed of incandescent coke is reached. cated below the top of the coke bed, and the producer is operated by suction at these final outlets. When the completely oxidized gaseous products from the upper bed pass through the incandescent coke bed, hydrogen is produced from the steam, by Well known endothermic action, and carbon monoxid is produced from the carbon dioxid and the carbon ot' the coke7 and these stable or fixed combustible gases are delivered to the final gas outlets. Merely as a matter of regulation, air inlets are provided to introduce air into the producer chamber between the two fuel beds and into the gaseous products of combustion from the first bed, to keep up the temperature of the coke bed to the gasifying point, but it is thought usually such intermediate air supply will not be necessary. Also merely for regulation under varying conditions, air may be admitted \1n derneatlrtlie lower-bed ot' incandescent coke, to gasify any coke which may hare escaped gasication and' passed below the gas outlets, but it is also thought that ordinarily this underneath air supply will not bc needed.

An embodiment of my invention by which tbc process may described with reference to the accompanying drawings, after which l will point out my invention in claims.

Figure 1 is a median vertical section of a lgse producer edarted to carry out my invention. Fig. 2 1s line --zr of Fi 1.

The illustra embodiment of myfinvena sectional plan on the l ducer chamber ha ving there accumulates Final gas outlets are los be carried out will now be tion comprises a vertically` arranged proan upright body portion-l and au arched top i2. The construction shown especially intended for gasifying ca king bituminous coul. The coal is first ignited on a grate shown as coinprising a `u'iechanical stokcr. The grate arrangement or construction of stoker shown is well known as applied to thc :furnaces oil steam boilers. livotcd gratos or grate scc tions i are arranged in the form of a terrace or in successive steps, the grate shelrcs being piroted to an inclined support l. i'hc coal is continuously agitated and fed downward and .across the grates by rocking or sha king the gratos fi. Rocking morement may be imparted to the gratesby a link 5 common to all the grate sections 3 and to which' is pivotally connected a rocking lever tu which in turn is actuated by u pitman T and eccentric S carried by a continuously rotating shaft 9. The coal is not completely consumed iii-this upper fuel bed, and when the partly consumed coal or coke reaches thc inner edge or lower edge of the grate it falls lo the bottoni of the producer chambcr and. to form a second fuel bed of incandescent coke. The grate stepsl 3 are so constructed and arranged as to prevent any of the fuel thereon from falling through to the back thereof, but all of the unoxidized solid portions of the fuel, including ash and cinders if any, are dropped to the lower bed or second bed. As fast as the coal in its coked or artly consumed form dropped i'r'oni the ower and innier edge ol the grate of the Stoker it is replenished with green or fresh coal continuously supplied to the up )er and outer edge of such stokcr grate.

he means for supplying or feeding fuel tothe grate comprifes aluel holuier l0 and a horizontal discharge tube or chute ll lead ing from the hopper and opening or discharging upon the ul'ipermost ot' the grate sections The coal dest-cud` by '"avity from the hopper 1.0 into the horit/.ontal chute l1 and is fedthrough the chute ll :o rcplenish the fuel bed on the gratcs. lhc means for feeding the coal through the chute l1 are shown as comprising a reciproca-ting plunger 12 fitting in the chute 1l contiguous to the outlet opening of the hopper it). The feed plunger l2 is'. adapted to be rcciprocated by a link 13 pivotally connected thereto and to a bell crank lcror l-Il. rl`he bell crank lcrcr lil is actuated bv a pitman 15 and eccentric lo cari-lcd by the contin'lr ously rotating .shaft i). The pitman l5 is adjustable radially on the bell crank lever 14. by means of a slot as shown. and the rate of feed of fuel may be controlled hy adjusting the pitman 15 alongr the slot to diiferent positions radially to the fulcrlun pivot of the bell crank lever, to thereby give a longer or shorter stroke tothe feed plunger 12.

Air is supplied to the burning coal on the gratos in substantially the same manner that it usually supplied te :in ordinary grate fire under a steam boiler, but in the present instance the air supply is limited and regulated so as to secure the desired result of complete combustion of the volatile fuel constituents only, or of more or less partial combustion of the non-volatile constituents also, accordingly as desired. The greater part of the air is supplied beneath the grates 3 and passes through the grates and through the burning coal contained thereon. The means for' supplying air beneath the grates comprise-au air passage or air conduit 17 shown as opening into an air space or chain- .)er formed below the grates by a casingr 18. The quantity of air passing through the burning fuel may be regulated by a damper 19 in the conduit or passage 17. The means shown for actuating the damper 19`comprise ahianjually actuatable `screw 20, "he air conduit 17 obtains air from a preheating chamber 21 having an atmospheric air inlet 22.

Combustion of the volatile 'fuel constituents will for the most part take place within the upper fuel bed,but there will be some volatile vapors distilled near the surface of the bed and especially from the greener port-ions of the fuel andwhich will esca e-unconsumed from the surface f the fue bed; Under some conditionsof) operation sufficient air may not pass through the fuel bed to comq pletely oxidize or entirely burn these escaping vapors, therefore provision is made for admitting air immediately above the fuel bed when desired. The means provided for this purpose comprise an air inlet opening 23 located'at the front of and just above the file on the Grates. The air inlet open ing 23 is controlled b `damper 24 which may be adjusted to regu. ate the amount of air admitted at this point.

-The incandescent partly consumed coal or coke which falls from the upper fuel bed is received at the bottom of the producer chamber on an rdinary grate 25 disposed at a distance above the bottom of the chamber sufficient to provide an ash pit as shown beneaih the`grate 25, Several openings being provided for the removal of the ashes and closed by doors 26. At some distance above the grate 25 a number (shown as three) of filial gas outlets or discharge tubes 27 communicate Withrthe producer chamber and unite to form a service conduit 28 which may lead to any point of use or storage of the gas. The entrances to the discharge tubes 27 are shown as provided with screens 29 to pre vent the entrance thereto of colte or cinders from the producer chamber. The body 1 of thc producer chamber is preferably provided with an undercut groove forming a ring discharge as shown. The preiieatmg chamber 2,1 surrounds the ras discharge tubes 27 and serves the doub e purpose of boiling tigo nir mipriliorl fr the Driller RIU'- fuce oi the upper fuel bed and of cooling the discharge gas.

In operation the incandescent coke which falls 'from the grates of the upper fuel bed accumulates on the lower grate 25 and forms a second or lower fuel bed of al depth extending for some distance above the final gas outlets 27. The producer is operated by suction applied to the service conduit 28.

`The air admitted through the air inlet conduit 17 and damper 19 passes through the upper-ignited fuel bed, and'the air, if any, acmitted through the damper Q4 passes immediately over! such fuel bed, and all of the volatile fuel constituents, such, for example, as tar and volatile gases` are distilled and completely oxidized or entirely burned. These completely oxidized gases or gaseous products ofcomplete combustion pass downward and through the incandescent bed of coke, on their way to the final gas outlets 27. In the second bed the combustible constituents of the second bed and the gaseous products of oolnpletecombustion from the first bed chemically unite to, form fixed combustible gases. lt should be particularly noted that these gaseous precincts of complete combustion comprise volatile distillates, includ-- ing` tarry vapors which have chemically united with the full quantity of oxygen which they are ca able of taking up and are, therefore, not on y fixed but are dead and inert. This absolutely precludes the possibility of the presence of tar inthe final product of combustible gas delivered for use, for the reason that lall tari-v distillates -are destroyed before the building up of the filial product of fixed combustible gas is begun, and at. a point or location that is isolated or distinctly separated from the location where the final gaseous product is formed. The upright body portion 1 of the producer is long enough or extends far enough above the top of the second fuel bed to permit all of the vapors or volatile fuel constituents to become completely oxidized `in the space between the two fuel beds and thereby to prevent any unconsuuied gases or vaporsl from reaching the bed of incandescent coke. The extent of the combustion at the first fuel bed should always be sufficient to entirely consume all of the volatile constituents of the fuel; and if found de,- sirable in any particular instance enough additional air may be admitted to consume also some of the non-volatile constituents, that is to burn and reduce sonic of the coke to cinders or to ashes. Should some air pass through the first fuel bed no harm whatever would result. VAlso incidentally it should be noted as possible that sometimes the temperature of the first or upper fuel heil may become high enough to disassociate or decompose sonic oi tin` steam into `separate hydrogen and oxygen.

'lo meet particular exigencies and condi tions` olE seri ice means are provided fo.' admill-in; air into the gaseous products ol' combustion between the two t'uel beds. Such means comprise ail' inle'. openings 29 in the upright or vertical body 1 of the producer al a point below the e' 'at'es 3. The air inlets :3H are. controlled by duuipers 30 which may he opened or closed more or less as desired. [luder most conditionsy it is thought it will not he neecssary to :uhnit any air whatever through the dampers Il() and inlets 29, but should it he necessary to raise the telnperature ot' the lower fuel bed air may be thus admitted. The dempers 2l() therefore serve merely for the purpose oi regulation. vision is also made for admitting air beneath the lower fuel bed, `to eli'ect regula` tion 'and etfect perfect operation under special conditions, hut it is thought that ordinarily it will be unnecessary to admit air at this pointn The means provided for admitting air below the lower fuel bed comprise dampers 31 located in the ash pit, doors 2G. Air is admitted through the dempers 31 to gasify any coke that may have passed below the gas outlets. This as` sui-es complete gasification ot the colte. at the hottolu. Air admitted at. the bottom of the chamber will act on the colte in the saine manner as it is acted on in an ordinary producer. The action oi" the producer in producing gas will he continuons during' ash removal, because as the ashesare laken out the coke hed will settle down belonr the outlets and operaie as above described, Sue tion at` the gasdischarge conduit will dran' in air through whatever dalnpers may he at the time open and in quantities' correspond ing to the extent to which the dempers are open.

Although ealiing` and rlinl\'erinj are reduced to a minirmnn,A yet it'y is best to have f means for pokingr the fuel beds. Accordingly such means are provided and con brise, a poking cover frl loeatetl in the inclined portion of the lop The rover 2&2 may he opened to poire either the upper had of burning' coal or the lower hed ot' iin-nndeseent colte. The poking' will notV interfere with the continuons production oll gras.` and `thisl is oi' advantag'g'e. lwralise an engine l'ed hv the prednrer may continue to operate. ll'hen the over is open the lovver party or main body of the producer chamber acts in the `same manner as an ordinary producer.

'lhe action tal iu; v place at the upper fuel hed and in the gasregion between the fuel beds is exothernn'c or heat producing and vthe action tak'ingphlce at the lower fuel hed is endothermicor heat consuming and reaching' thciower bed or coke bed.

these(exotherinie and endothernsic reactions are (-on-ipletely1 separated so that lall gases which enter the lower fuel bed are in ancondit'ion or state ot vom plete oxidation before eolie hed hasl no high temperature carbon timid formation zone, but, on the contrary, constitute a reduction :cone solely having a lower temperature; there'l'ore there is no tendency to elinlter er to burn the lining and no possibility oi burning gasformed by air leale; as in single bed producers. The lemperalure oi' the main hed or coke bed is maintained by incandescent ai'cret ions from thcirst bed and hy the heat ot the gaseous products ol' complete combustion from the iii-sl hed, all of which have a hightemperature and which add their sensible heat to maintain the temperature of the colte bed. The hieh tenuierature carbon dioxid zone is at the first or upper fuel bed. On acronut of the con'iplete separatmn of the eX- olhermic and the endoth .finie reactions the gasii'ying temperature may he licpti down without the addition of inueh ii any steam, giving a gas containing less hydrogen and correspondingly richer in carbon monoxid. Hydrogen, as is well known, has properties rendering' it to some extent objectionable as` a gas engine fuel. Also' the final gaseous product Will contain no gaseous hydrocarbons, and` of more importance yet, will be suhstantiallfy constant 1n composition. The pas l'ormed is particularly suited to the refpiiremcnts oi" gas engines, havingl a low heatinpl valiie and no illuinimatingl value.

Air stoppage from caking in the upper fuel hed is substantially obviated by the continual agitation of the burning; 'fuel by the 'continuously rockingir crates. the re-luccd tendency to clinlfer the producer may he operated for longer periods than is uniud. "llie nir passing through and over the upper t'uel bed cinupletely oxidizes or entirely burns the volatile constituents of livA hiel. and the heat generated. byihis combustion raises to a higzlrtemperatnre both the graf-,rotes products of complete combustion and the non-volatile fuel constituents, the latter consisting' mostly of coke which` is heated to ineandescence. lt is evident from the above description that the operation of the producer is continuous.

The principal characteristics of my inven-` tion are the complete separation of the exotherinic and the endot'hermic reactions and the production of the first; or exothermic reaction by the admission of nir in proper. regulated quantities, including the passing of air in limited and regulated quantities through the' first fuel bed; and the principal advantagesof my 'invention are obvjatmg caking, and freedom `from tar of the gas roduced and `the production .of a gas whic is On account o'f 1goA 1very constant in composition. A further great advantage is the complete control of all the chemical and mechanical processes.

It is obvious that various modifications may be made in the construction shown and above particularly described within the principle and scope of my invention.

l. A gas producer comprising a container, means for forming a fuel bed at one location, means for substantially continuously feedin fuel to the bed. adjustable means for contro ling the rate of feed of the fuel, Aieans for substantially continuously agitatin'g the fuel during combustion,` adjustable means for supplying air to the fuel bed in regulated quantities, means for removing all of the unoxidized portions of solid fuel from the fuel bed to another location to form at the second location a second fuel bed distinctly separated from the first bed and so related thereto that substantially all unconsumed gases from the first bed will be completely oxidized before reaching the second bed. und means for compelling the completely oxidized gases from the first bed to pass through the second fuel bed.

2. gas producer comprising a chamber, a grate in the chamber at the top of the chamber, means for substantially continuously feeding fuel to the grate, adjustable means for controlling the rate of feed of the fuel, means for substantially continuously agitating the fuel during combustion, ad-V justable means for supplying air through the grate in regulated quantities, means for passing all of the partly consumed solid fuel from the grateto a separate fuel bed at the lower part of the chamber and so distinctly separated from the first bed as not to be reached by gases from the grate fire which have not yet been completely oxidized, and means for passing the completely oxidized gaseous products of combustion from the grate lire through the bed of partly consumed solid fuel at the bottom o the chamber.

Z-, A\ ons producer comprising a rhamber,-

means fiir forming a fuel bed at the top of the chamber, means for substantialff continuously feeding fuel to the bed, adjustable means for controlling the rate of feed of the fuel, means for substantially continuousl agitating the fuel during combustion, ads justable means for passing air in regulated quantities through the burning fuel, means for passing all of the 'partly consumed fuel from the bed to the lower art of the cham? ber to form there a secon fuel bed so distinctly separated from the first fuel bed that substantially all unconsumed vases from the s first fuel bed will be complletey oxidized belfore reaching the second ed, and means for passing the completely oxidized gaseous products of combustion of theY fi'r'st bed through the second bed.

4. A gas producer comprising a chamber, means for forming a fuel bed at the top of thechamber, means for substantially continuously feedin'g fuel to the bed, adjustable means for controlling the rate of feed of the fuel, means for substantially continuously feeding' all of the unconsumed solid fuel across the bed and dropping it' all to the lower part of the chamber to form there a second fuel bed, distinctly separated from the first bed and so related thereto that sub stantially all unconsumcd gases from the first bed will be completely oxidized before reaching the second bed` adjustable means for passing air in regulated quantities through the first bed` means for passing air in regulated quantities over the first bed, and means for passing the completely oxidized gaseous products of combustion of the first bed through the second bed.

5. A gas producer comprising a chamber. means for forming a fuel bed at the top of the chamber, means for substantially continuously feeding fuel to the bed, adjust able means for controlling the rate of feed of the fuel. means for substantially continu ous-ly feeding all of the unconsumed solid fuel across the bed and droppingrit all to the lower part of the chamber to form there a second fuel bed distinctly separated from the first bed and so related thereto that substantially all unconsumed gases 'from the first bed Will be completely oxidized before reaching the second bed, adjustable means for passing air in regulated quantities through the first bed, an air inlet for the chamber between the two fuel beds-` and a final gas outlet for the chamber below the level of the top of the second fuel bed:

6. A gas producer comprising a chamber. means for forming a fuel bed at the top of the chamber, means for substantially con tinuously feeding fuel to the bed, adjustable means for controlling the rate of feed of the fuel, means for substantially continuously feeding-all of thc unconsunied solid fuel across the bed and dropping it all to the lower part of the chamber to form there a second fuel bed distinctly separated from the first bed and so related thereto that substantially' all unconsumed gases from the first bed will be completely oxidized before reaching the second bed, adjustable means for passing air in regulated quantities through the first bed, an air inlet for the chamber below the second fuel bed, and a final gas outlet for the chamber below the level. of the top of the second fuel bed.

'i'. A ras roducer comprising a chamber` means fbi` fldrming a fuel bed at the top of the chamber, means for substantially continnously feeding fuel to the bed, adjustable tiuuously feeding fuel to the bed, adjuattuhle ineens for controlling the rute of feed of the l fuel, menus for substantially Conti'nuouslyl feeding all of the uneousuxned solid fuel :li-rose the lied und dropping it all to the lower purl ol' the elnnulier to forni there a seeond fuel bed dietiuetll.Y Separated from the tiret hed und so reluted thereto that sulli StuntiulltY ull uneouuuuu'd gg'tles from the lirbt lied `will lie eonipletel;T oxidized before renehingl the ASecond hed. adjustable menne for passing nir in reguluted quuntiitieey through the first. bed, un :tir inlet, for the o chandler between the two l'uel beds, another :tir inlet for the chamber helow the ,el-vond fuel bed` vund :i tiunl gus outlet for the; chamber belov the level of the top of the t Second fuel hed.

S. A gas producer comprising a chamber-M means for forming u fuel bed et lthe top of the ehtunber, means for Substnntiully eonl nieznhv for eontrolliug the rute of feed of the l fuel, menus for Substantially continuously feeding all of the uneoiwunied solid fuel no1-oss the lied und dropping it all to the lower part of the chamber to forni there a second fuel bed distinctly separated from the tiret hed und so related thereto that Suh tnntiully ull uneonsuuied grues from thei tiret lied will lie completely oxidized before relu-hing the eeeond hed` udjuetulile nuuxue'sH for passing :tir in reguluted quuntities through the first bed, an air inlet for the elunnlier urhore the lint fuel lied, un nir inlet `t'or the t-huniller below the first fuel hed und i :lliure the wond fuel hed, unolhe uit' inlet for the eluuulier below the second fuel lied. und :l` flnnl gus outlet for the ehuulher lielow the level of the top of the second fuel lied. .'l. .it gus producer comprisingy :1 Container, ineunS for forming u fuel hed :it one, loerttiou, menus for substantially continuously feeding .fuel to the bed, adjuetz'thle means for controlling' the rute oi feed of the fuel, i

rutioi: to form et the second locution :i Sec.

ond ,l'uel bed distinctly separated from the t'rst lied und so related thereto t'hut euhstuutiully ull uneonsumed guise` from the tiret hed will loe completely oxidized before reaching the seeoud bed, and menne. for compeilingf the completely oxidized gages from the tiret hed to pass through the Seeotul bed.

lt). gue produeer comprising u chamber,

: fruto in the ilulniber ut the top of the 1f-liun'ilier. uuuiuh' lor suhstzintiully continun ouslvt."feedingl fuel to' the grate to form ithereon n l'uel bed. adjustable menu` for eoutrolliug the rute of feed of the fuel, menne for ,substantially continuously agitating the fuel during combustion. adjustable menus for supplying air through the. grate in regulated quantities, means for suhstun tiull)V i-uutiuuously feeding :ill of the solid iuieousunurl iortione ol' fuel uci-ose the bed und dropping it ull tothe lower part of the v-lnnnlwr tu torni there u seeond fuel bed distilu'tlxY selmrzited from the first` hed and so reluted thereto t'luit sulretuntiully ull un* eoueulued euses from tite first hed will o wunpletely oxidized laefore reaching the ser und hell. un nir inlet for the ehunil'ler :lliure the tirst luel hed. :tu uit' inlet ,for the chumher lielow the` first fuel lived :md :tbovr the ferinuhfuel hed. :another :nir inlet for the "imiulier lielou' tlu- `-uufoiifll fuel lied. un!! l tiuul fue outlet fur the rlaruulfer helou the ti-: of iluy woud fuel lied.

ln testimony hereof l ullix my zellguuttmin prou-uve of tw tfittnewes.

Wu anun' Hmmm-i.y llmiteuut llxtlix,

titi 

